This study elaborated the theoretical meaning of corporate communications by defining the basics and by presenting leading theories, the participants and the field of implementation, all in order to explain its role and importance in the business process of a certain company. Besides, the example of the Adris Group Company served for conducting a quantity and in one part quality analysis of materials published by the media about the group and its members where the numbers of daily media releases and calculations of PR values were compared to the value of Adris Group shares at the Zagreb Stock Exchange. This is how the study attempted to verify the given hypothesis about existing significant connections between the quantity of media releases with stock values on the financial market, and a significant connection between PR values of these releases with the listed price on the stock market. The obtained results, although with certain indications about an existing connection, were not able to verify the given hypothesis to a degree of certainty that would be satisfactory. In the end, it turns out that the role and importance of corporate communications can still be observed through obtained results, but the significance of corporate communications and means for measuring its efficiency require a different methodology of approach, which is currently the subject of debates in scientific and professional circles.